private void cmbSymbolType_SelectedIndexChanged(object sender, EventArgs e)
        {
            
            if (cmbSymbolType.SelectedItem.ToString() == "Simple")
            {
                if (tabSymbolProperties.TabPages.Contains(tabPicture))
                {
                    tabSymbolProperties.TabPages.Remove(tabPicture);
                }
                if (tabSymbolProperties.TabPages.Contains(tabCharacter))
                {
                    tabSymbolProperties.TabPages.Remove(tabCharacter);
                }
                if (tabSymbolProperties.TabPages.Contains(tabSimple) == false)
                {
                    tabSymbolProperties.TabPages.Insert(0, tabSimple);
                    tabSymbolProperties.SelectedTab = tabSimple;
                    
                }
            }
            if (cmbSymbolType.SelectedItem.ToString() == "Character")
            {
                if (tabSymbolProperties.TabPages.Contains(tabPicture))
                {
                    tabSymbolProperties.TabPages.Remove(tabPicture);
                }
                if (tabSymbolProperties.TabPages.Contains(tabSimple))
                {
                    tabSymbolProperties.TabPages.Remove(tabSimple);
                }
                if (tabSymbolProperties.TabPages.Contains(tabCharacter) == false)
                {
                    tabSymbolProperties.TabPages.Insert(0, tabCharacter);
                    tabSymbolProperties.SelectedTab = tabCharacter;
                }
            }
            if (cmbSymbolType.SelectedItem.ToString() == "Picture")
            {
                if (tabSymbolProperties.TabPages.Contains(tabSimple))
                {
                    tabSymbolProperties.TabPages.Remove(tabSimple);
                }
                if (tabSymbolProperties.TabPages.Contains(tabCharacter))
                {
                    tabSymbolProperties.TabPages.Remove(tabCharacter);
                }
                if (tabSymbolProperties.TabPages.Contains(tabPicture) == false)
                {
                    tabSymbolProperties.TabPages.Insert(0, tabPicture);
                    tabSymbolProperties.SelectedTab = tabPicture;
                }
            }

            if (_ignoreChanges) return;
            
            int index = ccSymbols.Symbols.IndexOf(ccSymbols.SelectedSymbol);
            if (index == -1) return;
            ISymbol oldSymbol = ccSymbols.SelectedSymbol;
            
            if (cmbSymbolType.SelectedItem.ToString() == "Simple")
            {

                SimpleSymbol ss = new SimpleSymbol();
                if (oldSymbol != null) ss.CopyPlacement(oldSymbol);
                ccSymbols.Symbols[index] = ss;
                ccSymbols.RefreshList();
                ccSymbols.SelectedSymbol = ss;
            }
            if (cmbSymbolType.SelectedItem.ToString() == "Character")
            {
                CharacterSymbol cs = new CharacterSymbol();
                if (oldSymbol != null) cs.CopyPlacement(oldSymbol);
                ccSymbols.Symbols[index] = cs;
                ccSymbols.RefreshList();
                ccSymbols.SelectedSymbol = cs;
            }
            if (cmbSymbolType.SelectedItem.ToString() == "Picture")
            {
                PictureSymbol ps = new PictureSymbol();
                if (oldSymbol != null) ps.CopyPlacement(oldSymbol);
                ccSymbols.Symbols[index] = ps;
                ccSymbols.RefreshList();
                ccSymbols.SelectedSymbol = ps;
            }
        }