係囉，2014 年了，我仲用緊 VS2008，大概 VS2008 係我最後用的 Microsoft IDE 吧！哦，VS2010 也有在用，不過比較少。
最近在搞 VS2008 + ReportViewer 10，搞搞吓發覺啲 Toolbox 內的 items 失咗蹤，如下圖：
根據 StackOverflow 網友的指示：
My good sense tells me that something got corrupted in your installation. Here's what I would try before attempting a repair (this happened recently): I fixed this by going into my profile as follows: C:Documents and SettingsMYUSERNAMELocal SettingsApplication DataMicrosoftVisualStudio8.0ProjectAssemblies There are four HIDDEN files in there that make up what is apparently the toolbox cache. If you erase them, they will be re-generated and #13119 will go back to General. As I said, these files appear to be hidden so configure the file explorer accordingly. Second problem: my User controls disappeared from the toolbox. I was able to fix it by going into the VS menus: Visual Studio "Tools" menu "Options" submenu "Windows Form Designer" tab "General" tab Set "AutoToolboxPopulate" to "True"
清除了 Toolbox 的 cache，VS2008 恢復正常的畫面，如下：
