void channelFolderToolStripMenuItem_DropDownOpening(object sender, EventArgs e)
{
ToolStripDropDownItem toolStripMenuItem = sender as ToolStripDropDownItem;
ChannelFolder channelFolder = toolStripMenuItem.Tag as ChannelFolder;
PopulateChannelsFolderInDropDownMenu(toolStripMenuItem.DropDownItems, channelFolder);
}