Default Tooltip Control Message Processing
This section describes the window messages handled by the window procedure for the TOOLTIPS_CLASS window class.
| Message | Default processing |
| WM_CREATE | Ensures that the tooltip control has the WS_EX_TOOLWINDOW and WS_POPUP window styles. It also allocates memory and initializes internal variables. |
| WM_DESTROY | Frees resources allocated for the tooltip control. |
| WM_GETFONT | Returns the handle of the font currently selected into the DC for the tooltip control. |
| WM_MOUSEMOVE | Hides the tooltip window. |
| WM_PAINT | Draws the tooltip window. |
| WM_SETFONT | Selects a new font handle into the DC for the tooltip control. |
| WM_TIMER | Hides the tooltip window if the tool has changed position or if the cursor has moved outside the tool. Otherwise, it shows the tooltip window. |
| WM_WININICHANGE | Resets internal variables that are based on system metrics. |