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You can also use text editor (Notepad++) to model your window blinds. For this you can follow the following steps:
1) Definition of blind properties by using WindowMaterial:Blind.
2) Construction of the window including blind material (the name used in step 1). e.g.
Construction,2001,     !- Project external glazing - Material layer names follow:
38,                            !- Generic PYR B CLEAR 3MM
1002,                         !- AIR 13MM
2,                               !- Generic CLEAR 3MM
20001;                        !- Blind with high reflectivity slats
3) Then, you have to define the shading control by using WindowProperty:ShadingControl object. 
I hope this will help. Please let me know if you want further explanation on any of these steps.
