Unable to cast object of type 'System.Windows.Forms.SplitContainer' to type 'System.ComponentModel.ISupportInitialize'.
新建项目时，.NET框架采用的是4.0
编译前，手动改为3.5，则出现异常：
Unable to cast object of type 'System.Windows.Forms.SplitContainer' to type 'System.ComponentModel.ISupportInitialize'.
只有手动改为4.0，或者4.0 client profile