isolateSelectWithMeshes.mel

string $currentPanel = `getPanel -withFocus`; 
int $state = `isolateSelect -q -state $currentPanel`;
if ($state) {
    enableIsolateSelect $currentPanel false;
} else {
    enableIsolateSelect $currentPanel true;
    $allMeshObjs = `ls -typ mesh`;
    for ($eachObject in $allMeshObjs) {
        isolateSelect -addDagObject $eachObject $currentPanel;
    }
}