1 files changed, 4 insertions, 0 deletions
diff --git a/src/client/views/collections/CollectionTreeView.tsx b/src/client/views/collections/CollectionTreeView.tsx
index 285598600..c39df2c76 100644
--- a/src/client/views/collections/CollectionTreeView.tsx
+++ b/src/client/views/collections/CollectionTreeView.tsx
@@ -52,6 +52,7 @@ export type collectionTreeViewProps = {
 export class CollectionTreeView extends CollectionSubView<Partial<collectionTreeViewProps>>() {
     public static AddTreeFunc = 'addTreeFolder(this.embedContainer)';
     private _treedropDisposer?: DragManager.DragDropDisposer;
+    private _mainEle?: HTMLDivElement;
     private _titleRef?: HTMLDivElement | HTMLInputElement | null;
     private _disposers: { [name: string]: IReactionDisposer } = {};
     private _isDisposing = false; // notes that instance is in process of being disposed
@@ -82,6 +83,8 @@ export class CollectionTreeView extends CollectionSubView<Partial<collectionTree
 
     @observable _titleHeight = 0; // height of the title bar
 
+    MainEle = () => this._mainEle;
+
     // these should stay in synch with counterparts in DocComponent.ts ViewBoxAnnotatableComponent
     @observable _isAnyChildContentActive = false;
     whenChildContentsActiveChanged = action((isActive: boolean) => {
@@ -131,6 +134,7 @@ export class CollectionTreeView extends CollectionSubView<Partial<collectionTree
     };
     protected createTreeDropTarget = (ele: HTMLDivElement) => {
         this._treedropDisposer?.();
+        this._mainEle = ele;
         if (ele) this._treedropDisposer = DragManager.MakeDropTarget(ele, this.onInternalDrop.bind(this), this.Document, this.onInternalPreDrop.bind(this));
     };