To access the C1FlexGrid Column Editor, use the C1FlexGrid Tasks menu, the context menu, or the Properties window. For more information on editing columns with the C1FlexGrid Column Editor, see C1FlexGrid Column Editor.
Click the smart tag ( ) in the upper right corner of C1FlexGrid to open the C1FlexGrid Tasks menu, and select Designer.
Right-click on the form and select Designer from the context menu.
In the Properties window, click the ellipsis button next to the Cols property.