v3.5.0 CheckComboBox只能点击下拉区域才显示数据

Assessment

Research direction

Description

Describe the bug

只有点击方框内的区域才可以显示下拉数据，点击左侧显示区域的没有反应。但是3.4.0-release版本无此现象。

Steps to reproduce the bug

HandyControl-v3.5.0-Release CheckComboBox

Expected behavior

No response

Screenshots

No response

NuGet package version

HandyControl 3.5.1

IDE

Visual Studio 2022

Framework type

.Net 8.0

Windows version

Windows 11 (22000)

Additional context

No response

Getting set up

First steps

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2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
3. Fork the repository and make your change on a branch.
4. Open a pull request that references the issue number.

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