NotEnoughItems/src/main/java/codechicken/nei/NEICreativeGuiHandler.java

package codechicken.nei;

import net.minecraft.client.gui.inventory.GuiContainer;
import net.minecraft.client.gui.inventory.GuiContainerCreative;
import net.minecraft.creativetab.CreativeTabs;

import codechicken.nei.api.INEIGuiAdapter;

public class NEICreativeGuiHandler extends INEIGuiAdapter {

    @Override
    public VisiblityData modifyVisiblity(GuiContainer gui, VisiblityData currentVisibility) {
        if (!(gui instanceof GuiContainerCreative)) return currentVisibility;

        if (((GuiContainerCreative) gui).func_147056_g() != CreativeTabs.tabInventory.getTabIndex())
            currentVisibility.showItemSection = currentVisibility.enableDeleteMode = false;

        return currentVisibility;
    }
}