Gets or sets the hit test buffer for all AnnRunDesigner derived classes.
The hit test buffer, in container units, for all AnnRunDesigner derived classes. The default value is 0.
The hit test buffer is used to make the test point "bigger" to compensate for errors and provide smoother hit-testing. For example, if the buffer value is 2, a square with sides 4 units long around the test point will be used to perform the hit-testing.
The value of HitTestBehavior controls how objects are hit-tested through a selection rectangle.
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