private void mnuView_Click(object sender, EventArgs e)
 {
     m_mousemode = eMOUSEMODE.eView;
     SetMouseModeChecks();
 }
 private void mnuScale_Click(object sender, EventArgs e)
 {
     m_mousemode = eMOUSEMODE.eModelScale;
     SetMouseModeChecks();
 }