Hi list I have build a small application, like it is shown in the header.rb example. But I want do change the amount of the child of the FXHorizontalFrame. This child are FXList''s. I want to remove some of this list while the program is running. That for I iterate through the FXHorizontalFrame and calls .destroy for each one. Look at the function : clearAll But it seems not working. Can any one of you say me the best way of solving my problem? Alexander code: ---- class HeaderList < FXScrollWindow attr_reader :colors, :lists, :header def initialize(parent, opts=0, x=0, y=0, width=0, height=0)#, padLeft=DEFAULT_SPACING, padRight=DEFAULT_SPACING, padTop=DEFAULT_SPACING, padBottom=DEFAULT_SPACING, hSpacing=DEFAULT_SPACING, vSpacing=DEFAULT_SPACING) super(parent,opts|SCROLLERS_NORMAL,x,y,width,height)#,padLeft,padRight,padTop,padBottom,hSpacing,vSpacing) @lists = [] @packer=FXPacker.new(self,LAYOUT_FILL_X|LAYOUT_FILL_Y,0,0,0,0, 0,0,0,0, 0,0) @header = FXHeader.new(@packer,nil,0,HEADER_RESIZE) @header.connect(SEL_CHANGED) { |sender, sel, which| @lists[which].width = @header.getItemSize(which) } @content = FXHorizontalFrame.new(@packer, LAYOUT_FILL_X|LAYOUT_FILL_Y,0,0,0,0, 0,0,0,0, 0,0) @colors=[FXRGB(255,240,240),FXRGB(240,255,240),FXRGB(240, 240, 255)] @actC = 0 end def addRow(text,icon=nil,size=0,data=nil,notify=false) item = FXHeaderItem.new(text,icon,size,data) @header.appendItem(item,notify) (size == 0)? (siz = item.getWidth(@header)) : (siz = size) list = FXList.new(@content,nil,0, LAYOUT_FILL_Y|LAYOUT_FIX_WIDTH,0,0,siz,0) list.backColor = @colors[@actC] @actC = (@actC+1)%@colors.length() @lists.push(list) end def appendItemTo(index,text,icon=nil,data=nil,notify=false) @lists[index].appendItem(text,icon,data,notify) end def clearAll() @header.clearItems() @lists.clear() @content.each_child{|list| list.destroy } #@content.destroy puts @content.numChildren end end