Returns a Variant containing a list of image format data types 
that can be set for this framebuffer, based on the current format selected, the 
render channel type and the rendering engine selected for this framebuffer's 
Pass.
The list of data types is given as a 1-dimensional array of data type strings. 
Although the data type can be any string, many of them are predefined in 
siImageDataType.
| // get accessor Object rtn = Framebuffer.DataTypes; |