AnimationEditorPlugin.AnimationEditorPlugin.HandleIfAchx C# (CSharp) Method

        private void HandleIfAchx(TreeNode selectedTreeNode)
        {
            ReferencedFileSave rfs = selectedTreeNode?.Tag as ReferencedFileSave;

            bool shouldShowAnimationChainUi = rfs != null && rfs.Name != null && FileManager.GetExtension(rfs.Name) == "achx";




            if (shouldShowAnimationChainUi)
            {
                if (!mContainer.Controls.Contains(mTab))
                {
                    mContainer.Controls.Add(mTab);

                    mContainer.SelectTab(mContainer.Controls.Count - 1);
                }

                if (mAchxControl == null)
                {
                    mAchxControl = new MainControl();

                    ToolStripMenuItem saveToolStripItem = new ToolStripMenuItem("Force Save", null, HandleSaveClick);
                    mAchxControl.AddToolStripMenuItem(saveToolStripItem, "File");

                    ToolStripMenuItem forceSaveAllItem = new ToolStripMenuItem("Re-Save all .achx files in this Glue project", null, HandleForceSaveAll);
                    mAchxControl.AddToolStripMenuItem(forceSaveAllItem, "File");


                    mAchxControl.AnimationChainChange += new EventHandler(HandleAnimationChainChange);
                    mAchxControl.Dock = DockStyle.Fill;
                }

                mTab.Text = "  Animation"; // add spaces to make room for the X to close the plugin

                if(!mTab.Controls.Contains(mAchxControl))
                {
                    mTab.Controls.Add(mAchxControl);
                }
                if(mTab.Controls.Contains(mTextureCoordinateControl))
                {
                    mTab.Controls.Remove(mTextureCoordinateControl);
                }

                string fullFileName = FlatRedBall.Glue.ProjectManager.MakeAbsolute(rfs.Name);
                mLastFile = fullFileName;

                if (System.IO.File.Exists(fullFileName))
                {
                    mAchxControl.LoadAnimationChain(fullFileName);
                }
            }
            else if (mContainer.Controls.Contains(mTab))
            {
                mContainer.Controls.Remove(mTab);
            }
        }