The DM_GETCURSORSIZE message is sent to the dialog handler to retrieve
the cursor size in edit lines or in DI_USERCONTROL controls.
Param1
The ID of the dialog item for which you want to retrieve the cursor position.
Param2
0
Return
The high word is the cursor size (from 0 to 100, as used in the
CONSOLE_CURSOR_INFO structure),
the low word is the cursor visibility flag (1 - the cursor is visible, 0 - the cursor is hidden).