public void expand()
{
if (_isCollapsed)
{
_cancelStatus = false;
GroupEventArgs beforeExpand = new GroupEventArgs(this);
if (BeforeExpand != null)
{
BeforeExpand(this, beforeExpand);
}
_cancelStatus = beforeExpand.Cancel;
if (beforeExpand.Cancel)
{
return;
}
_isCollapsed = false;
_owner._groupCollapseChanged(this);
if (AfterExpand != null)
{
AfterExpand(this, new GroupEventArgs(this));
}
}
}
public void collapse()
{
if (!_isCollapsed)
{
_cancelStatus = false;
GroupEventArgs beforeCollapse = new GroupEventArgs(this);
if (BeforeCollapse != null)
{
BeforeCollapse(this, beforeCollapse);
}
_cancelStatus = beforeCollapse.Cancel;
if (beforeCollapse.Cancel)
{
return;
}
_isCollapsed = true;
_owner._groupCollapseChanged(this);
if (AfterCollapse != null)
{
AfterCollapse(this, new GroupEventArgs(this));
}
}
}
