void block_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
DraggableLabel t = sender as DraggableLabel;
ActualText.Text = (t).Text;
PosX.Text = t.PositionX.ToString();
PosY.Text = t.PositionY.ToString();
SizeX.Text = t.SizeX.ToString();
SizeY.Text = t.SizeY.ToString();
FontName.Text = t.FontName;
selected = elements.FindIndex(x => x == t);
}
private void Add_Text_Click(object sender, RoutedEventArgs e)
{
DraggableLabel block = new DraggableLabel();
block.Text = "TEXT";
block.FontName = "Arial";
block.Cursor = Cursors.Hand;
block.MouseLeftButtonDown += block_MouseLeftButtonDown;
elements.Add(block);
selected = elements.Count - 1;
UI.Children.Add(block);
}