Turning a certain point on form a specified color in MSVC++.NET

What do you mean by "a certain point" ?

If it is to just color a specified area then perhaps you could just override the OnPaint method of the Form (or Panel or Control), and use the Graphics object to draw a Rectangle (or another shape).
To control if and how the area is painted, you could pre-assign and test against a private boolean field. To paint in a dynamic location, you could simply read the coordinates of an existng control or the mouse.
Finally, to force the paint event, use the Invalidate() method, optionally passing a Region parameter so as not to repaint everything.

I have not included code samples here as I am not 100% certain of C++ syntax, but if you think it would help i could give it a go...

ANOTHER WAY:
The above method is perhaps not very user friendly with the VS.NET GUI designer, so an easier way to do it would be to simply create a Label control with blank text and give it a size, location, and background color of your choosing. Then simply set its Visible property to true or false when you want to show/hide it, thereby emulating "coloring" a certain area of your form.

Alright, I've written a simple form in C++ that draws a small rectangle wherever you click it. Hopefully you can extract from the code below what it is you need to do. I haven't catered for alterable point sizes or colors (it is always 10x10 and red), but I'm sure you'll find that easy enough to do.

Hope this helps.

namespace MyApp
{
using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;

public __gc class Form1 : public System::Windows::Forms::Form
{

private: bool drawRect;
private: System::Drawing::Point rectPoint;
private: System::Drawing::Size rectSize;
private: System::Drawing::Brush * rectBrush;

public:
Form1(void)
{
this->ClientSize = System::Drawing::Size(500, 500);
this->Text = S"MyForm";
this->MouseDown += new System::Windows::Forms::MouseEventHandler(this, Form1_MouseDown);

drawRect = false;
rectPoint = NULL;
rectSize = System::Drawing::Size(10, 10);
rectBrush = System::Drawing::Brushes::Red;
}

protected:
virtual void OnPaint(System::Windows::Forms::PaintEventArgs* e)
{
Form::OnPaint(e);
if (drawRect)
{
int x = rectPoint.X - (rectSize.Width / 2);
int y = rectPoint.Y - (rectSize.Height / 2);
e->Graphics->FillRectangle(rectBrush, x, y, rectSize.Width, rectSize.Height);
}
}

private:
System::Void Form1_MouseDown(System::Object * sender, MouseEventArgs * e)
{
drawRect = true;
rectPoint = Point(e->X, e->Y);
this->Invalidate();
}

};
}

If it's just a black dot you want, make the Rectangle 1x1 and the Brush black.

If you are new to C++ and want to program in .NET, I would maybe suggest going for VB or C# instead... but that's your choice!

The code provided returned this for 10 errors and 1 warning:
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(10) : error C4980: '__gc' : use of this keyword requires /clr:oldSyntax command line option
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(16) : error C3699: '*' : cannot use this indirection on type 'System::Drawing::Brush'
compiler replacing '*' with '^' to continue parsing
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(22) : error C3921: Use of S-prefixed strings requires /clr:oldSyntax command line option
When compiling with /clr, an implicit conversion exists from string literal type to System::String^. If necessary to avoid ambiguity, cast to System::String^
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(32) : error C3699: '*' : cannot use this indirection on type 'System::Windows::Forms::PaintEventArgs'
compiler replacing '*' with '^' to continue parsing
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(44) : error C3699: '*' : cannot use this indirection on type 'System::Object'
compiler replacing '*' with '^' to continue parsing
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(44) : error C3699: '*' : cannot use this indirection on type 'System::Windows::Forms::MouseEventArgs'
compiler replacing '*' with '^' to continue parsing
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(32) : warning C4485: 'MyApp::Form1::OnPaint' : matches base ref class method 'System::Windows::Forms::Form::OnPaint', but is not marked 'new' or 'override'; 'new' (and 'virtual') is assumed
c:\windows\microsoft.net\framework\v2.0.50215\system.windows.forms.dll : see declaration of 'System::Windows::Forms::Form::OnPaint'
Specify 'override' (and 'virtual') to override the ref class virtual method
Specify 'new' (and 'virtual') to hide the ref class virtual method with a new virtual method
Position for 'new' and 'override' keywords is after method parameter list
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(23) : error C3867: 'MyApp::Form1::Form1_MouseDown': function call missing argument list; use '&MyApp::Form1::Form1_MouseDown' to create a pointer to member
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(23) : error C2750: 'System::Windows::Forms::MouseEventHandler' : cannot use 'new' on the reference type; use 'gcnew' instead
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(23) : error C3350: 'System::Windows::Forms::MouseEventHandler' : a delegate constructor expects 2 argument(s)
c:\documents and settings\compaq_owner\my documents\visual studio 2005\projects\myapp\myapp\Form1.h(26) : error C2065: 'NULL' : undeclared identifier
I get the feeling that perhaps it is a little bit different than what you thought. Did you use the MSVC++.NET 2005 Express IDE to make that code?
Thanks,
The Digital Pioneer

Yeah, I use 2005 beta 2. You can get that for free. The others are aprx. $500-$1000. I can't afford that. I am 13 years old!!!
Anyways, the languages change quite a bit between compiler versions. I've noticed. It's so hard to find a good tutorial for C++.NET. But, as you said, is there anyone who knows all the little changes who can give me something to work with.
And Phizz, thanks. Maybe the code doesn't work, but I gleaned a few ideas from it, that might be enough to get me through.
One more question, how can I get a list of events and have the IDE set me up a handler? The MSVB.NET 2005 Betas 1 & 2 had that feature.
Thanks,
The Digital Pioneer

I added a VB version for everyone.

Public Class Form1

Private drawRect As Boolean = False

Private rectPoint As System.Drawing.Point = Nothing

Private rectSize As New System.Drawing.Size(10, 10)

Private rectBrush As System.Drawing.Brush = Brushes.Red

Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown

drawRect = True

rectPoint = New Point(e.X, e.Y)

Me.Invalidate()

End Sub

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint

Dim x, y As Integer

If drawRect Then

x = rectPoint.X - (rectSize.Width / 2)

y = rectPoint.Y - (rectSize.Height / 2)

e.Graphics.FillRectangle(Brushes.Red, x, y, rectSize.Width, rectSize.Height)

End If
End Sub
End Class