How to app a pop up dialog box in customization screen

To use the values from the workflow dialog, change your action definition to set field values based on the fields you add to your dialog:

var viewOrder = context.ActionDefinitions
    .CreateExisting<ProdDetail_Extension_1>(g => g.ConnectToMRN, a => a
    .WithCategory(repairCategory)
    .WithFieldAssignments(fas =>
    {
        // This will assign 'YourDac.YourField' the value from the dialog
        fas.Add<YourDac.yourField>(f => f.SetFromFormField(formAssign, "ConnectTo"));
    })
    .WithForm(formAssign));

Hi @darylbowman It works now. but I can’t access the selected value in the scope of action method, I tried following codes. 
            var data = Base.Caches<MRMaterialRequest>().Current as MRMRNRefNbrDac;
            var data = adapter.Get<MRMaterialRequest>().ToList().First();
But both are not works for me.

I don't believe you can do that, no. Workflow is it's own little ecosystem.

If you wanna write regular code, you'd need to pop a custom smart panel with Base.SomeView.AskExt(). It's more work and has its own oddities but it would work with more normal code.

Hi @darylbowman 
I Implement a separate dialog box as below.
 

	<px:PXSmartPanel runat="server" ID="PanelConnectToMRN" Caption="Connect To MRN" CaptionVisible="True" Height="360px" LoadOnDemand="True" Width="960px">
		<px:PXFormView runat="server" ID="formConnectToMRN" Caption="Connect To MRN" CaptionVisible="False" DataMember="MRNView" SkinID="Transparent" Width="100%" DataSourceID="ds">
			<Template>
				<px:PXSelector runat="server" ID="CstPXSelector3" DataField="RefNbr" />
				<px:PXButton runat="server" ID="ConnectToMRNBtn" Height="20px" Text="OK" /></Template></px:PXFormView></px:PXSmartPanel></asp:Content>

Following is the code related to action in ProdDetails graph extention
 

public SelectFrom<MRMaterialRequest>.View MRNView;

        public PXAction<AMProdItem> ConnectToMRN;
        [PXButton(CommitChanges = true)]
        [PXUIField(DisplayName = "Connect To MRN", MapEnableRights = PXCacheRights.Select, MapViewRights = PXCacheRights.Select)]
        protected virtual IEnumerable connectToMRN(PXAdapter adapter)
        {
            MRNView.AskExt();
            string msg = "WOrk fine";
            PXLongOperation.StartOperation(this,
            () => ConnectToMRNDoc(msg)
            );
        return adapter.Get();
        }

        public static void ConnectToMRNDoc(string refNbr)
        {
            string msg = "Triggers the method " + refNbr;
            throw new PXException(msg);
        }

But still not working the button. it shows the button in UI, when clicks nothing happens. Didi not show any error.
Note: I use the skinId as Transparent, it is the id used in other default panels in the screen

Sorry, I forgot an important piece. The dialog needs to be called from a PXFilter view of the type of record that the dialog will display. Usually a new unbound DAC is created with the fields that you want on your dialog. Then, bind that view name to the form the way you did.

AskExt returns a PXDialogResult, so you can map different results to your buttons and find the user's intent.

Last thing is, the dialog method runs twice: once to show the dialog, once to continue after the dialog. This makes the behavior more tricky. I'm not certain why you're not receiving an error, but I would try something like PXTrace.WriteInformation to use as an indicator instead of throwing an exception. You can check the trace and see if it's making it there.

Hi @darylbowman I update the code as below. but the still same issue. MRNView.AskExt(); throws a null reference exception.

       public PXFilter<MRMRNRefNbrDac> MRNView; 

public PXAction<AMProdItem> ConnectToMRN;
        [PXButton(CommitChanges = true)]
        [PXUIField(DisplayName = "Connect To MRN", MapEnableRights = PXCacheRights.Select, MapViewRights = PXCacheRights.Select)]
        protected virtual IEnumerable connectToMRN(PXAdapter adapter)
        {
            try
            {
                MRNView.AskExt();
            }catch (Exception ex)
            {
                string errorMsg = ex.Message;
                throw new PXException(errorMsg);
            }

            string msg = "WOrk fine";
            PXLongOperation.StartOperation(this,
            () => ConnectToMRNDoc(msg)
            );
        return adapter.Get();
        }

Create a separate Dac as below
 

    [PXHidden]
    public class MRMRNRefNbrDac : PXBqlTable, IBqlTable
    {
        #region RefNbr
        [PXString(15, IsFixed = false)]
        [PXUIField(DisplayName = "Ref Nbr")]
        [PXSelector(typeof(MRMaterialRequest.refNbr), typeof(MRMaterialRequest.refNbr))]
        public virtual string RefNbr { get; set; }
        public abstract class refNbr :
        PX.Data.BQL.BqlString.Field<refNbr>
        { }
        #endregion

    }

Looking over my personal documentation, I believe a key part of this is having the ‘key’ of the smart panel be the name of your data view:

Also, the dialog itself is raised by an exception, so if you wrap it in a try / catch, that is almost certainly going to actively prevent it from opening.

I usually do something like this:

if (MyPanel.AskExt(true) != WebDialogResult.OK) return;

//Do some useful Stuff

Thank you for sharing your solution with the community @PDharmasena10!