    function g_LoadMuxParamCallback(varargin)   
    % This callback is called whenever the user selects a Mux block (or 
    % Demux). The callback opens the panel to set the only parameter
    % associated to this type of block: the number of inputs.
    % The function sets also the dimension of the block accordingly.
        
        if strcmp(get(gcbh,'Tag'),'mux'),
          % Text: 'Number of inputs:'
            uicontrol('Parent',currPanel,'BackgroundColor',backColor,'Units','pixels','HorizontalAlignment','left','Position',[100 panelDimens(4)-60 100 20],'String','Number of inputs:','Visible','on','Style','text');
          % Edit field:
            uicontrol('Parent',currPanel,'Units','pixels','HorizontalAlignment','center','Position',[210 panelDimens(4)-57 50 20],'String',get(gcbh,'Inputs'),'Visible','on','Enable','on','Callback',@MuxEditCallback,'Style','edit');
        elseif strcmp(get(gcbh,'Tag'),'demux'),
          % Text: 'Number of outputs:'
            uicontrol('Parent',currPanel,'BackgroundColor',backColor,'Units','pixels','HorizontalAlignment','left','Position',[100 panelDimens(4)-60 100 20],'String','Number of outputs:','Visible','on','Style','text');
          % Edit field:
            uicontrol('Parent',currPanel,'Units','pixels','HorizontalAlignment','center','Position',[210 panelDimens(4)-57 50 20],'String',get(gcbh,'Outputs'),'Visible','on','Enable','on','Callback',@MuxEditCallback,'Style','edit');
        end

    %----------------------------------------------------------------------
    function MuxEditCallback(hObject, varargin)   
    % This callback is called whenever the user modify the number of inputs
    % associated to a Mux block (or outputs to a Demux)
    
         newValue   = str2double(get(hObject,'String'));
       % Check it's an integer:
         newValue = round(newValue);
         set(hObject,'String',num2str(newValue));
         for i=1:length(selBlocks)
             newDimens=get(selBlocks(i),'Position');
             newDimens(4)=newDimens(2)+25*(newValue+1);
             if strcmp(get(gcbh,'Tag'),'mux'),
                 set(selBlocks(i),'Inputs',num2str(newValue));
             elseif strcmp(get(gcbh,'Tag'),'demux'),
                 set(selBlocks(i),'Outputs',num2str(newValue));
             end
             set(selBlocks(i),'Position',newDimens);
         end
    end
    %----------------------------------------------------------------------
    
    end