widget focus and tabstack

Hello
1.widget focus
how can i set focus to specifed widget?
i try to use XtSetKeyboardFocus(tab_stack, text_edit); but nothing happens

2.tabstack
i try to add new tab in the TabStack with

<br />
  text_edit = XmCreateScrolledText(tab_stack, filename, NULL, 0);<br />

and tab name is set to filename+"SW".
i need to use RowColumn to remove "SW"-suffix ?
but when i use RowColumn ScrolledText doesn't attach to tab borders:
<br />
  n=0;<br />
  XtSetArg(args_col[n], XmNtopAttachment, XmATTACH_FORM);  ++n;<br />
  XtSetArg(args_col[n], XmNleftAttachment, XmATTACH_FORM);  ++n;<br />
  XtSetArg(args_col[n], XmNrightAttachment, XmATTACH_FORM);  ++n;<br />
  XtSetArg(args_col[n], XmNbottomAttachment, XmATTACH_FORM);  ++n;</p>
<p>  col = XmCreateRowColumn(tab_stack,"tab",args_col,n);<br />
  text_edit = XmCreateScrolledText(col, "text_edit", NULL, 0);<br />
  XtManageChild(text_edit);<br />
  XtManageChild(col);<br />

p.s. openMotif-2.3