private void InitChannelNumbering()
{
this.listViewChannelNumbering.SuspendLayout();
this.listViewChannelNumbering.Items.Clear();
currentChannelIndentation = 0;
maxChannelNumber = 0;
mapChannelsIndentation.Clear();
InitChannelNumberingRecursedTree(MainForm.rootChannelFolder);
this.listViewChannelNumbering.ResumeLayout();
numericUpDownNumberingClickStart.Value = maxChannelNumber + 1;
}