This message sets the minimum and maximum button widths in the toolbar control.
TB_SETBUTTONWIDTH wParam = 0; lParam = (LPARAM)(DWORD) MAKELONG(cxMin,cxMax);
Not used.
Minimum button width, in pixels. Toolbar buttons are never narrower than this value.
Maximum button width, in pixels. If button text is too wide, the control displays it with ellipsis points.
Nonzero indicates success. Zero indicates otherwise.
Header
commctrl.h