Request additional flag for ImageGenerateRoIMask

// current approach to remove drawing that is not to be used in mask
// another option is to move the drawing to a different layer (e.g. Overlayer) and back to ProgFront
// could also repeat the steps on a group list gList

Function toggle_group(string wname, string gname)

    string gCMD = "DoWindow/F " + wname + ";SetDrawLayer ProgFront;DrawAction begininsert;"

    DrawAction/W=$wname/L=ProgFront getgroup=$gname, commands
    gCMD += ReplaceString("\r",ReplaceString("\t",GrepList(S_recreation,"^// ;*",1,"\r"),""),";")
    DrawAction/W=$wname/L=overlay getgroup=$gname, delete

    DoUpdate/W=$wname

// perform the image mask operation

    ImageGenerateROIMask/W=wname imageinstance

// return the removed drawing

    Execute/Z gCMD
   
    return 0
end

// desired approach

Function mask_onlygroup(string wname, string gname)

// perform the image mask operation

    ImageGenerateROIMask/W=wname/G=gname imageinstance
   
    return 0
end