Err too much.

container/slot/OptionalSlotNormal.java

@@ -0,0 +1,26 @@
+package appeng.container.slot;
+
+import net.minecraft.inventory.IInventory;
+
+public class OptionalSlotNormal extends AppEngSlot
+{
+
+	final int groupNum;
+	IOptionalSlotHost host;
+
+	public OptionalSlotNormal(IInventory inv, IOptionalSlotHost containerBus, int slot, int xPos, int yPos, int groupNum) {
+		super( inv, slot, xPos, yPos );
+		this.groupNum = groupNum;
+		host = containerBus;
+	}
+
+	@Override
+	public boolean isEnabled()
+	{
+		if ( host == null )
+			return false;
+
+		return host.isSlotEnabled( groupNum );
+	}
+
+}