Allows C1Graphics descendant to override drawing of some render fragments. This method should return true if drawing implemented by the C1Graphics in the custom way. Only background and content should be drawn, borders are drawn always.

'宣言
 
Public Overridable Function CustomDraw( _
   ByVal rf As RenderFragment, _
   ByRef fdp As FragmentDrawParams _
) As System.Boolean

'使用法
 
Dim instance As C1Graphics
Dim rf As RenderFragment
Dim fdp As FragmentDrawParams
Dim value As System.Boolean
 
value = instance.CustomDraw(rf, fdp)

public virtual System.bool CustomDraw( 
   RenderFragment rf,
   ref FragmentDrawParams fdp
)