Shell Isolated and IVsSolutionLoadManager

Hi. I am created an application based on Visual Studio Shell Isolated. But I have an problem with IVsSolutionLoadManager implementation. It doesn't work in Shell Isolated mode.

Here is my code:

public int OnBeforeOpenProject(ref Guid guidProjectID, ref Guid guidProjectType, string pszFileName,
    IVsSolutionLoadManagerSupport pSLMgrSupport)
{
    pSLMgrSupport.SetProjectLoadPriority(guidProjectID, (uint)_VSProjectLoadPriority.PLP_LoadIfNeeded);
    return VSConstants.S_OK;
}

In Shell Integrated mode this code is work.

Can anyone help me, please?