Attach property not working on SubForm or Edit fields

[mkromberg]

Run DemoTabs. Note that the TabControl and each Edit field is defined using Attach:

{"WC":{"ID":"F1.TC","Properties":{"Attach":["Top","Left","Bottom","Right"],"MultiLine":1,"Posn":[100,0],"Size":[500,600],"Type":"TabControl"}}}
and
{"ID":"F1.TC.SF2.TEXT","Properties":{"Attach":["Top","Left","Bottom","Right"],"Font":["Times New Roman",16],"Posn":[10,10],"Size":[450,580],"Style":"Multi","Text":"Lorem ipsum ...con","Type":"Edit"}}}

However, when the form is resized, neither the TabControl nor the Edit field honour the Attach property.

The current callback on Configure of the form corrects this:

{"WS":{"ID":"F1.TC","Properties":{"Size":[500,600]}}}
{"WS":{"ID":"F1.TC.SF1.TEXT","Properties":{"Size":[450,580]}}}
...etc...

But it should be unnecessary, as they should already have these sizes.

[mkromberg]

Related to #97 Support the Attach Property.