The SB_SETMINHEIGHT message sets the minimum height of a status window’s drawing area.
SB_SETMINHEIGHT wParam = (WPARAM) minHeight; lParam = 0;
No return value.
The minimum height is the sum of wParam and twice the width, in pixels, of the vertical border of the status window. An application must send the WM_SIZE message to the status window to redraw the window. The wParam and lParam parameters of the WM_SIZE message should be set to zero.