public void AddLayer(Layer layer)
{
// Unselect all layers
foreach (var item in Layers)
item.IsSelected = false;
// Unselect all layers
foreach (Layer item in f_workSpace.Children)
item.IsSelected = false;
Layers.Add(layer);
f_workSpace.Children.Add(layer);
layer.Width = f_workSpace.Width;
layer.Height = f_workSpace.Height;
}