User define missing value by Labtalk: wks.col.missing =
User define missing value color by Labtalk: wks.nancolor =
Add button in matrix mini toolbar to set missing value color
Allow matrix sheet show or hide selector by Labtalk: wks.ImgSel = 1/0
If missing value color is customized in matrix and plot imagemage from it, same color should be used for missing value.