Matrix Chart View
    When Matrix is selected as the Chart Type, the
       Toolbar appears
      like this:
      
     
 
    
      - Select a Matrix chartable file in the Overlay Toolbox Charting
          tab.
      - Matrix charts do not dynamically change,
          instead they show data that is dynamically accessible for
          viewing on the surface/volume in other viewing tabs. 
      - When viewing a CIFTI
            Parcel to parcel connectivity (.pconn.nii) file matrix, left
            click on a row to select a parcel (will be outlined with a horizontal box
                in the matrix). Parcel connectivity for
            the selected parcel will be displayed on Viewing
                  Tabs that are showing the parcel
            connectivity file as a layer. 
      - A parcel can also be
            selected by clicking on a surface/volume in another
              Viewing Tab and the corresponding parcel row will be
              outlined in the matrix.
 
        
            
        
            
        
          - When viewing a CIFTI Parcel Scalar (.pscalar.nii) file
              matrix, the y-axis rows are parcels and the x-axis columns
              are Map indices. When the map index is set in Overlay
                    Toolbox: Layers for any non-Chart
              Viewing Tab, a vertical box appears in the matrix around
              the column for the selected map index. 
 
         
        
          - Chart Attributes: To adjust
              attributes of the matrix chart display, such as the cell
              width and cell height. The default setting fills the
              Viewing Area with the matrix cells. The Reset
              button resets the cell size to the default. 
          - Tab: These across Tab
              functions do not affect Chart View.