Tab Control: Partial paint when restoring dialogbox - c++

Question

The edges of my tab control (SysTabControl32) are not fully repainted after restoring dialog box from minimized state.
Example:
The control is defined in the resource file (EDIT all occurences of IDD_VJOYCONF):
IDD_VJOYCONF DIALOGEX 0, 0, 245, 282
STYLE DS_SETFONT | DS_MODALFRAME | DS_3DLOOK | DS_FIXEDSYS | DS_CENTER | WS_MINIMIZEBOX | WS_POPUP | WS_VISIBLE | WS_CAPTION | WS_SYSMENU
EXSTYLE WS_EX_APPWINDOW
CAPTION "vJoyConf - Configure vJoy Devices"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
PUSHBUTTON "Reset All",IDC_RSTALL,98,261,50,14
CONTROL "",IDC_DEVTABS,"SysTabControl32",TCS_MULTILINE | TCS_TOOLTIPS,7,7,231,247
END
#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO
BEGIN
IDD_VJOYCONF, DIALOG
BEGIN
LEFTMARGIN, 7
RIGHTMARGIN, 238
TOPMARGIN, 7
BOTTOMMARGIN, 275
END
END
#endif // APSTUDIO_INVOKED
Developing with VS2013 on Windows 8.

Answer 1

The problem was solved by lifting the margin of the dialog box internal to the tab control.
The more interesting thing is how I found the problem.
I used Sysinternals Process Explorer. It has a 'Find Window's Process' button:
[EDIT:]
I hovered over the entire dialog box, highlighting its various elements until I've highlighted the culprit element:
You can clearly see that it's bottom is clipped exactly where the problem is. This is the dialog box that is embedded in the tab control.
The solution was to raise the dialog box so it won't be clipped.