是否有可能在状态之间转换，直到wf中发生多个事件？

I am developing a State Machine Workflow using C# and WF in visual studio 2008. On one of my states I need to wait for multiple events to happen until the workflow can transition to the next state. As an example think of a unanimous voting scenario. I cannot find a way to do this. Does anyone have a solution or workaround for this problem? I am developing a State Machine Workflow using