When this tool is already activated, the first mouse-move will call CopyPrototype and add the resulting object, as the NewObject, to the view. Further mouse-moves will continuously resize the NewObject (or the NewObject's SelectionObject if ResizesSelectionObject is true) according to the bounds returned by ComputeBox.

If this tool is started but not yet activated, mouse-moves are ignored when Modal is true until a mouse-down activates this tool. When Modal is false, a mouse-move automatically activates this tool so that the NewObject is created and mouse moves resize it.

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

GoToolCreating Class
GoToolCreating Members
Base Implementation in DoMouseMove