You can specify a column's width when creating it by setting the column's width property. Ater that, users may resize the FlexGrid columns using the mouse. As in Excel, they may drag the column header's right edge, or double-click the edge to auto-size the the column so it fits its content.
Two typo's:
https://developer.mescius.com/wijmo/demos/Grid/Columns/Resizing/purejs
You can specify a column's width when creating it by setting the column's width property. Ater that, users may resize the FlexGrid columns using the mouse. As in Excel, they may drag the column header's right edge, or double-click the edge to auto-size the the column so it fits its content.
Grid/Columns/Resizing