I think here's some problems in this sdk file(october 2005).

Or the sdk is right but I am wrong?I am not sure...
in dxmutgui.cs

line 853,MessageProc()
not set the isDialogMinimized..
so when click the Caption,it's not minimize..

line 1654 OnRender()
Rectangle(0, -captionHeight, width, 0);
the last param is 0.so the caption even dosen't show at all..
I think he/she copied the code form the C++ version of UT,but the two rects is different.