How to set properties for the Reference Group form control from code

There is a small issue in AX 2012 with getting access to the siblings' properties of Reference Group form control - they are unavailable in AOT.

However, you still can get access to it from code during run time.

Let's say you have placed on your form a field named FilterCategory, which is a reference group, and you want to set its sibling FilterCategory_Name width to Column width value. As you can see there is no way to do that in AOT.

So you just create a method supposed to be called in the form init():

void setColumnWidthForFilterCategory()
{
    int                                 i;
    Object                              childControl;

    for (i = 1; i <= FilterCategory.controlCount(); i++) // FilterCategory is of FormReferenceGroupControl type
    {
        childControl = FilterCategory.controlNum( i );
        childControl.width( 0, FormWidth::ColumnWidth );
    }
}

And you get it!