There are three FixedDocumentViewerModes which specify the behavior of RadPdfViewer when you left-click in the document and move the mouse around (without releasing the left button of the mouse):
None: The control does nothing;
Pan: The document is scrolled in the respective direction;
- TextSelection – selection is initiated, which stops when you release the button of the mouse;
The viewer mode can be changed using the RadPdfViewerNavigator (as shown in the picture).
The mode of the viewer is set using the ViewerMode property:
this.radPdfViewer1.ViewerMode = FixedDocumentViewerMode.TextSelection;
Me.RadPdfViewer1.ViewerMode = FixedDocumentViewerMode.TextSelection