Lightswitch multi select dropdown

Question

hi

i am new to lightswitch.  

 

i have three tables.

table1

----- 

Id

start

startedtime 

 

table2 

----

id

t2Name

 

table3

----

id

t1id (one)

t2id (multiple)

 

here there is a relation between three tables, one to many

it means for each t1id there can be multiple t2id in table3

 

 

in table3 add/edit screen i am displaying a dropdown and one messages, when user selects from drop down and clicks save button,

1) i want to add one record in table1 with timestamp and get that id

2) save the data in table3 with selcted dropdown value and with the above id 

 

so for this i am inserting record in table 1 and getting id and saving data into table3  in tab3_inserting  method

 

but here there is one to many relationship is there so, i want to provide multi select dropdown and while saving i want to loop with slected values and save in table3 

 

can please any body help me how to create multiselect dropdown, it will help me alot

 

Thanks in advance.