Fires when the user presses any mouse button while over the PageLayoutControl.
ERROR: Syntax information about IPageLayoutControlEventsHelper.OnMouseDown may not be in D:\ArcGIS\DotNet\ESRI.ArcGIS.SystemUtility.dll
[C++]
HRESULT OnMouseDown(
long button,
long shift,
long x,
long y,
double pageX,
double pageY
);
[C++]Parameters
button [in] button is a parameter of type long shift [in] shift is a parameter of type long x [in] x is a parameter of type long y [in] y is a parameter of type long pageX [in] pageX is a parameter of type double pageY [in] pageY is a parameter of type double