int m_nHitTestFrame;?
Specifies the size of the hit-test area around grid lines. Default is 8 pixels.
If you set m_nHitTestFrame = -1, HitTest will always return GX_NOHIT unless you have implemented custom hit testing by overriding OnExtHitTest.
CGXGridCore::HitTest CGXGridCore::OnExtHitTest
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