Making a graph to mosaic tiff files

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Hi
I prepared a SAR change detection graph and run it using gpt, it worked very well. The results are three Tiff file, two tiff files for each coregistered SAR images, and one tiff file for final change mask.
I want to make a new graph to mosaic these three tiff files to the results of adjacent track, have couple of issues:

  1. Raster–>Geometric–>Mosaicking is not availabe in Graphbuilder, only Multi-Size Mosaic is avaialbe, what is the difference?
  2. The Variable tab is the Multi-Size Mosaic does shoe up anything, when I press “Choose the band to process” icon nothing comes up, in the Tiff file I have only one band which is not come up here.
    Has anyone used this module for tiff file and can help why I have this issue?

Thanks,
Zahra