If you try editing some generic reports like Performance in Visual Studio you will get an error saying that EnterpriseManagementChartControl is not installed. The reason is that SCOM 2007 does not configure EnterpriseManagementChartControl development environment during normal install. If you like to use chart control designer in Visual Studio you would need to configure it manually. Here are the steps:
Please note that these steps will only work with SCOM 2007 SP1 RC or later releases. The files mentioned here were not a part of SCOM 2007 RTM.