By default, the AllowResizeElement property is exLeftClick, which indicates that with a simple click on the element's border, the user can resize the element. Use the AllowResizeElement property to specify whether the element can be resized at runtime.  The AllowMoveElement property specifies the keys combination so the user can move the element from the cursor. The AllowResizeSelection property indicates whether the entire selection is resized if an element in the selection is resized. Set the AllowResizeElement property on exDisallow, to prevent user to resize any element in the surface. Use the Resizable / AutoSize property to prevent an element to be resized at runtime. The control fires the LayoutStartChanging(exResizeElement) / LayoutEndChanging(exResizeElement) event when the user resizes the object.