ListColumn.WidthActual
From Xojo Documentation
Property (As Integer )
aListColumn.WidthActual = newIntegerValue
or
IntegerValue = aListColumn.WidthActual
Supported for all project types and targets.
or
IntegerValue = aListColumn.WidthActual
Supported for all project types and targets.
The width of the column in pixels.
Example
This example sets the size of the first three columns in a ListBox.