show popup on tabbar button click react native

I'm working on an old project where tabbar is created using the Scene from 'react-native-router-flux'.There are five tabs, currently all are showing a particular class component, Bu my requirement hear is that I want to show a popup when click on the center tab and that popup should be shown on over that is open before that tabbar button click.

is this possible to achieve ?, currently I created a whold component with a small popup at the bottom, I tried making the background transparent to show the background view but it didn't work,

I have created the tabbar like this

import { Scene, Router, ActionConst, Actions } from 'react-native-router-flux';<Router><Scene key="root" hideNavBar><Scene key="main" tabBarStyle={styles.tabBarStyle} hideNavBar ><Scene        key="tabbar"        tabs        showLabel={false}><Scene key='phonebookTab' title="Phonebook" icon={TabIcon} initial ><Scene            key="phonebook"            component={HomeScreen}            title='Phonebook'            activeTintColor={colors.darkishPurple}            hideNavBar          /></Scene><Scene key='contactsTab' title="Contacts" icon={TabIcon} ><Scene            key="ContactsScreen"            component={ContactsScreen}            title='Contacts'            activeTintColor={colors.darkishPurple}            hideNavBar          /></Scene><Scene key='myNetworkTab' title="My Network" icon={TabIcon} ><Scene            key="myNetwork"            component={Contact}            title='My Network'            activeTintColor={colors.darkishPurple}            hideNavBar          /></Scene><Scene key='groupsTab' title="Groups" icon={TabIcon}><Scene            key="groups"            component={Group}            title='Groups'            activeTintColor={colors.darkishPurple}            hideNavBar          /></Scene><Scene key='settingsTab' title="Settings" icon={TabIcon}><Scene            key="settings"            component={Settings}            title="Settings"            activeTintColor={colors.darkishPurple}            hideNavBar          /></Scene></Scene></Scene><Router>