multiple mutatable views (mfc/c++)

i have sure support splitter. left i have (imaginatively named) cappview_leftand right i have cappview_right_1and cappview_right_2. by following formula i initialise twin primary views correctly:

if (!m_wndsplitter.createstatic(this, 1, 2))
{
    trace0("failed createstaticsplitter\n");
    relapse false;
}
else 
if (!m_wndsplitter.createview(0, 0, runtime_class(cappview_left), csize(300, 200), pcontext))
{
    trace0("failed emanate left pane\n");
    relapse false;
}
else 
if (!m_wndsplitter.createview(0, 1, runtime_class(cappview_right_1), csize(375, 200), pcontext))
{
    trace0("failed emanate initial right pane\n");
    relapse false;
}

...

what i emanate second perspective inside right frame, however i try supplement this:

if (!m_wndsplitter.createview(0, 1, runtime_class(cappview_right_2), csize(375, 200), pcontext))
{
    trace0("failed emanate initial right pane\n");
    relapse false;
}

vs compiles nonetheless fails run application, lifting an difference explanation me i have already tangible view.

can someone advise i this? also, change between views presumably perspective request class?