This visual is not connected to the presentationsource.

One 、 Problem description

1. Screenshot of the problem

• Problem code ：
• Front end interface diagram ：
  

2. Overview of the situation

Calculate one when the window is resized TreeView Control 、 And one. ListBox The height value of the control , This TreeView Control 、ListBox Control is located in TabControl Position inside , Click on Content - Indexes The error was reported after the project

Two 、 Cause analysis

This is because TabControl Only one interface can be displayed at a time , The corresponding interface location will be hidden , Lead to BookMarkTree.PointToScreen() Acquisition failure , Cause error .

3、 ... and 、 terms of settlement

1. Screenshot of solution result

2. Solution Overview

Cannot get the location of the hidden control . We can change the location reference of the developing control without changing it , I chose this TabControl Control location , Use this position to calculate TreeView Height