Why Button isn't framed on IE?

[Lbgxter]

Why the Button is not framed on IE?
I need to show the frame when Button is focused without not overriding the onFocus method.
Other some GXT widgets can be framed.
Are there technical problems?

com.extjs.gxt.ui.client.widget.button


protected void onFocus(ComponentEvent ce) {
if (!disabled) {
addStyleName(baseStyle + "-focus");
if (GXT.isFocusManagerEnabled() && !GXT.isIE) {
FocusFrame.get().frame(this); //I need to call this method but isn't called on IE.
}
}
}


com.extjs.gxt.ui.client.widget.layoutcontainer


protected void onFocus(ComponentEvent ce) {
if (GXT.isFocusManagerEnabled() && FocusManager.get().isManaged()) {
if (getFocusSupport().isIgnore()) {
for (int i = 0; i < getItemCount(); i++) {
Component c = getItem(i);
if (!c.getFocusSupport().isIgnore()) {
c.focus();
break;
}
}
} else {
FocusFrame.get().frame(this); // be called on IE.
}
}
}