@Override
    protected void doAttachChildren() {
        super.doAttachChildren();
        FocusUtil.forceFocus(() -> resizeTableToFitColumns(true));
    }
Add a resizable column that will initially expand so that the table fills the available space.
Unless manually resized, it will expand to fill but not go below the initialMinimumWidth.
Once the user resizes it, it becomes a fixed width column under their control.

@param initialMinimumWidth Initial minimum width in pixels. Ignored once the user has resized it.
stroom-core-client-widget/src/main/java/stroom/data/grid/client/MyDataGrid.java