Retrieves the top, left, bottom, and right margins set for a tool tip window.
Address of a RECT structure that will receive the margin information. The members of the RECT structure do not define a bounding rectangle. For the purpose of this message, the structure members are interpreted as follows:
Distance between top border and top of tool tip text, in pixels.
Distance between left border and left end of tip text, in pixels.
Distance between bottom border and bottom of tip text, in pixels.
Distance between right border and right end of tip text, in pixels.
This member function implements the behavior of the Win32 message TTM_GETMARGIN, as described in the Platform SDK.