diff --git a/FruitBankHybrid.Shared/Components/GridProductDto.cs b/FruitBankHybrid.Shared/Components/GridProductDto.cs
index 619e85c..2da7718 100644
--- a/FruitBankHybrid.Shared/Components/GridProductDto.cs
+++ b/FruitBankHybrid.Shared/Components/GridProductDto.cs
@@ -1,5 +1,12 @@
-namespace FruitBankHybrid.Shared.Components;
+using DevExpress.Blazor;
+
+namespace FruitBankHybrid.Shared.Components;
 
 public class GridProductDto : MgGridBase
 {
+    protected override void CustomizeElementHideDetailButton(GridCustomizeElementEventArgs e)
+    {
+        //Felülírjuk, h ne adja hozzá a "hideDetailButton" css class-t!
+        return;
+    }
 }
\ No newline at end of file
diff --git a/FruitBankHybrid.Shared/Components/GridProductDtoTemplate.razor b/FruitBankHybrid.Shared/Components/GridProductDtoTemplate.razor
index 639a476..bd29465 100644
--- a/FruitBankHybrid.Shared/Components/GridProductDtoTemplate.razor
+++ b/FruitBankHybrid.Shared/Components/GridProductDtoTemplate.razor
@@ -1,4 +1,5 @@
-@using AyCode.Core.Helpers
+@using System.Threading
+@using AyCode.Core.Helpers
 @using AyCode.Utils.Extensions
 @using DevExpress.Internal.About
 @using FruitBank.Common.Dtos
@@ -27,19 +28,19 @@
 		<DxGridCommandColumn Visible="!IsMasterGrid" Width="120"></DxGridCommandColumn>
 	</Columns>
 	<DetailRowTemplate>
-		@if (IsMasterGrid && LoggedInModel.IsDeveloper)
+		@if (IsMasterGrid)
 		{
 			var productId = ((ProductDto)context.DataItem).Id;
 
 			<DxTabs ActiveTabIndexChanged="(i) => OnActiveTabChanged(i, productId)">
-				<DxTabPage Text="Rendelések melyben megtalálható">
+				<DxTabPage Text="Rendelések melyben megtalálható" Visible="@LoggedInModel.IsDeveloper">
 					@{
 						//GetOrderDtosFromDbAsync(productId).Forget();
 						//var orderDtos = _orderDtos?.Where(o => o.OrderItemDtos.Any(oi => oi.ProductId == productId)).ToList() ?? [];
 						<GridDetailOrderDto OrderDtos="_currentOrderDtos" IsMasterGrid="false"></GridDetailOrderDto>
 					}
 				</DxTabPage>
-				<DxTabPage Text="Rendelés tételek">
+				<DxTabPage Text="Rendelés tételek" Visible="@LoggedInModel.IsDeveloper">
 					@{
 						//GetOrderItemDtosFromDbAsync(productId).Forget();
 						//var orderItemDtos = _orderItemDtos?.Where(oi => oi.ProductId == productId).ToList() ?? [];
@@ -77,6 +78,9 @@
 	private List<OrderDto>? _currentOrderDtos;
 	private List<OrderItemDto>? _currentOrderItemDtos;
 
+	private readonly SemaphoreSlim _lockOrderDtosByProductId = new(1);
+	private readonly SemaphoreSlim _lockOrderItemDtosByProductId = new(1);
+
 	private readonly Dictionary<int, List<OrderDto>> _orderDtosByProductId = new();
 	private readonly Dictionary<int, List<OrderItemDto>> _orderItemDtosByProductId = new();
 
@@ -125,29 +129,37 @@
 
 	private async Task<List<OrderDto>> GetOrderDtosFromDbAsync(int productId)
 	{
-		if (_orderDtosByProductId.TryGetValue(productId, out var orderDtos)) return orderDtos;
+		using(await _lockOrderDtosByProductId.UseWaitAsync())
+		{
+			if (_orderDtosByProductId.TryGetValue(productId, out var orderDtos)) return orderDtos;
 
-		orderDtos = await FruitBankSignalRClient.GetAllOrderDtoByProductId(productId) ?? [];
-		_orderDtosByProductId[productId] = orderDtos;
+			orderDtos = await FruitBankSignalRClient.GetAllOrderDtoByProductId(productId) ?? [];
+			_orderDtosByProductId[productId] = orderDtos;
 
-		return _currentOrderDtos = orderDtos;
+			return _currentOrderDtos = orderDtos;
+		}
 	}
 
 	private async Task<List<OrderItemDto>> GetOrderItemDtosFromDbAsync(int productId)
 	{
-		if (_orderItemDtosByProductId.TryGetValue(productId, out var orderItemDtos)) return orderItemDtos;
+		using (await _lockOrderItemDtosByProductId.UseWaitAsync())
+		{
+			if (_orderItemDtosByProductId.TryGetValue(productId, out var orderItemDtos)) return orderItemDtos;
 
-		orderItemDtos = await FruitBankSignalRClient.GetAllOrderItemDtoByProductId(productId) ?? [];
-		_orderItemDtosByProductId[productId] = orderItemDtos;
+			orderItemDtos = await FruitBankSignalRClient.GetAllOrderItemDtoByProductId(productId) ?? [];
+			_orderItemDtosByProductId[productId] = orderItemDtos;
 
-		return _currentOrderItemDtos = orderItemDtos;
+			return _currentOrderItemDtos = orderItemDtos;
+		}
 	}
 
 	protected async Task OnFocusedRowChanged(GridFocusedRowChangedEventArgs e)
 	{
+		if (!LoggedInModel.IsDeveloper) return;
+
 		var productDto = (ProductDto)e.DataItem;
 
-		//if (e.Grid.IsDetailRowExpanded(e.VisibleIndex))
+		if (e.Grid.IsDetailRowExpanded(e.VisibleIndex))
 		{
 			_currentOrderDtos = null;
 			_currentOrderDtos = productDto != null ? await GetOrderDtosFromDbAsync(productDto.Id) : [];
diff --git a/FruitBankHybrid.Shared/Components/MgGridBase.cs b/FruitBankHybrid.Shared/Components/MgGridBase.cs
index e14fa07..87b6622 100644
--- a/FruitBankHybrid.Shared/Components/MgGridBase.cs
+++ b/FruitBankHybrid.Shared/Components/MgGridBase.cs
@@ -41,6 +41,14 @@ public class MgGridBase : DxGrid
         //    Layouts = JsonSerializer.Deserialize<ObservableCollection<UserLayout>>(json);
     }
 
+    protected virtual void CustomizeElementHideDetailButton(GridCustomizeElementEventArgs e)
+    {
+        if (e.ElementType == GridElementType.DataRow && !LoggedInModel.IsDeveloper)
+        {
+            e.CssClass = "hideDetailButton";
+        }
+    }
+
     protected void OnCustomizeElement(GridCustomizeElementEventArgs e)
     {
         //if (!IsMasterGrid) e.CssClass = "hideDetailButton";
@@ -50,10 +58,7 @@ public class MgGridBase : DxGrid
             e.CssClass = " alt-item";
         }
 
-        if(e.ElementType == GridElementType.DataRow && !LoggedInModel.IsDeveloper)
-		{
-				e.CssClass = "hideDetailButton";
-        }
+        CustomizeElementHideDetailButton(e);
 
         if (e.ElementType == GridElementType.HeaderCell)
         {