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Provides information about the DockSite for the control.
Source position: controls.pp line 2257
The handler can adjust the InfluenceRect, within which mouse moves are recognized by this control. The handler also can deny any drops, depending on the dragging operation for the control.
OnGetSiteInfo occurs before the OnDockOver event handler.
Event handler for moves of a control over this docksite; determines acceptance or rejection of an possible drop.
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