在https://www.devexpress.com/Support/Center/Question/Details/T214296/missing-icons-from-toolbox找到解决方法
To work around this issue you can try resetting toolbox caches while your display scaling level is at 100%(while using the smaller fonts).
1. Close VisualStudio and clear the toolbox cache by deleting all *.tbd files from your profile. These files are hidden, so use "del /ah" from an elevated command prompt. For axample:
del /ah %localappdata%\microsoft\visualstudio\12.0\*.tbd
2. Go to the "Display" page in the control panel (Control Panel\Appearance and Personalization\Display): Right click on the desktop, select "Screen resolution" in the context menu, and in the "screen resolution page" select "Make text and other items larger or smaller" link.
3. In the "Display" page, select the "Let me choose one scaling level for all my displays" checkbox and then select the smaller font option, this is 100%, or no scaling.
4. Sign out from this session when prompted and sign back in
5. Start visual studio, toolbox will be re-populated on the startup and view the toolbox items whose icons were previously missing.
6. Set font scaling to the desired value by repeating steps 2-4
Toolbox item icons should be present in the toolbox when VS is re-started
翻译过来:
1.通过删除配置文件中的所有* .tbd文件，关闭VisualStudio并清除工具箱缓存。这些文件是隐藏的，因此请使用提升的命令提示符中的“del / ah”。例如：
del / ah％localappdata％\ microsoft \ visualstudio \ 12.0 \ * .tbd
2.转到控制面板中的“显示”页面（控制面板\外观和个性化\显示）：右键单击桌面，选择“屏幕分辨率” “在上下文菜单中，在”屏幕分辨率页面“中选择”使文本和其他项目更大或更小“链接。
3.在“显示”页面中，选中“让我为所有显示选择一个缩放级别”复选框，然后选择较小的字体选项，这是100％或不缩放。
4.在提示时退出此会话并在
5中重新登录。启动visual studio，将在启动时重新填充工具箱，并查看之前缺少图标的工具箱项目。
6。
重新启动VS时，工具箱中应存在工具箱项图标