/// <summary>
/// Sends the entity down the z-order stack with the specified amount.
/// </summary>
/// <param name="entity">The entity.</param>
/// <param name="zShift">The z shift.</param>
public void SendBackwards(IDiagramEntity entity, int zShift)
{
if (mPaintables.Contains(entity))
{
int newpos = mPaintables.IndexOf(entity) - zShift;
//if this is the first in the row you cannot move it lower
if (newpos >= 0)
{
mPaintables.Remove(entity);
mPaintables.Insert(newpos, entity);
ReAssignSceneIndex();
Rectangle rec = entity.Rectangle;
rec.Inflate(20, 20);
this.RaiseOnInvalidateRectangle(Rectangle);
}
}
}