void SRGScrollView::OnUpdateGraphZoomout(CCmdUI * pCmdUI)
Enables or disables the button and menu item which allows zooming out
If the graph has been zoomed, the button and menu will be active.
If the graph is in its original state, the button will be inactive.
Defined in: SRGScrollView.cpp
Parameters
pCmdUI
Button and/or menu command update interface