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virtual BOOL MButtonDown(UINT nFlags, CPoint point, UINT nHitState);

nFlags

Indicates whether various virtual keys are down. This parameter can be any combination of the following values:
MK_CONTROL Set if the CTRL key is down.
MK_LBUTTON Set if the left mouse button is down.
MK_MBUTTON Set if the middle mouse button is down.
MK_RBUTTON Set if the right mouse button is down.

MK_SHIFT Set if the SHIFT key is down.

point

Specifies the x- and y-coordinate of the cursor. These coordinates are always relative to the upper-left corner of the window.

nHitState

Specifies the state of the interaction. This parameter can be any combination of the following values:
GX_HITSTART: Mouse button has been pressed
GX_HITMOVE: Mouse cursor has been moved.
GX_HITEND: Mouse button has been released.
GX_SELECT: Cells will be selected.
GX_HITINCELL: Mouse cursor is in the cell where the mouse button has been pressed.
GX_HITLEAVE: Mouse cursor has left the cell where the mouse button has been pressed.
GX_CTRLPRESSED: User pressed the mouse button while pressing the CTRL key.

GX_HITCURRENTCELL: User pressed mouse in current cell.

TRUE if the message has been processed; FALSE otherwise.

Called when the user has pressed the middle mouse button.

The base-class version checks if a CGXChild was hit. If yes, it sets focus to the child (FocusOnChild) and calls its MButtonDown method.