Gets or sets the height (in text rows) of the page.
![](../icons/collapse_all.gif)
![](../icons/collapse_all.gif)
This value is valid on all IPageMessage instances created using the IMessageFactory interface, however it may be undefined (and hence have a value of -1) on instances received by an implementation of ISubscriptionListener.
The page coordinate system is 0-based, hence the maximum modifiable row will be Height - 1.