By default, the AllowResizeChart property is exMiddleClick, which means that once the user clicks the middle mouse button, the user can resize the chart by dragging. The ZoomWidth property specifies a value that indicates how large the chart will appear on horizontal axis. The LayoutStartChanging(exResizeChart) event notifies your application once the user starts resizing the chart. The LayoutEndChanging(exResizeChart) event notifies your application once the chart is resized. The ZoomHeight property specifies a value that indicates how large the chart will appear on vertical axis. Use the MinZoomWidth/MaxZoomWidth property to specify the limits on horizontal axis when the user performs resizing/zooming/shrinking. Use the MinZoomHeight/MaxZoomWidth property to specify the limits on horizontal axis when the user performs resizing/zooming/shrinking. The AllowMoveNode property specifies the combination of keys so the user can move a node from one parent to another.