write a route management page, click add Route pop-up modal, to fill out the form and verify it automatically. 
 but the button cannot be rendered correctly with  < div slot= "footer" > . 
Code:
html fragment:
<Modal v-model="addRouteModal" title="">
        <Form ref="newRouteInModal" :model="newRouteInModal" :rules="routeValidate" label-position="left" :label-width="100">
            <FormItem prop="target" label="IP">
                <Input v-model="newRouteInModal.target" :autofocus="true"></Input>
            </FormItem>
            <FormItem prop="genmask" label="">
                <Input v-model="newRouteInModal.genmask"></Input>
            </FormItem>
            <FormItem prop="gateway" label="">
                <Input v-model="newRouteInModal.gateway"></Input>
            </FormItem>
            <div slot="footer">
                <FormItem>
                    <Button type="primary" @click="addRouteModalOnOk("newRouteInModal")"></Button>
                    <Button type="ghost" @click="handleReset("newRouteInModal")"></Button>
                </FormItem>
            </div>
        </Form>
    </Modal>js fragment:
handleReset(name) {
    this.$refs[name].resetFields();
},
addRouteModalOnOk(name) {
    this.$refs[name].validate((valid) => {
        if (valid) {
            this.$Message.success("Success!");
        } else {
            this.$Message.error("Fail!");
        }
    });
}, if you use the modal native button, the  < FormItem >  attribute will be lost, and the  this.$ refs [name] .validate  will be invalidated. 
is there any way to use form"s form validation feature in modal?
